Toothache loose feeling inside the water may be periodontitis or apical periapical inflammation caused, it is recommended to go to the hospital for specific examination to confirm the diagnosis and timely treatment. Periodontitis teeth will have a certain degree of looseness, and there may be hot and cold stimulation pain, biting pain phenomenon. When you go to the dentist for examination, there will be pain on percussion, deep periodontal pockets, and the feeling of water inside may be bleeding gums or pus. The teeth with apical periodontitis have loose teeth due to the inflammation of the root tip, and there may be biting pain and tooth elongation. When you go to the dentist for examination, there will be pain on percussion, periapical area has a low-density image on the apical radiograph, and there is water inside which may be inflammatory pus in the periapical area.